Time & Measurement

The earliest people divided time into two intervals, nighttime and daytime. Today’s atomic clocks divide time into picoseconds—trillionths of a second! How did we get from there to here? Hardcover, 32 pages. Learn More

Children will journey through time and across civilizations to learn how human beings have relied on calendars to tell us when to plant, harvest, and rest. Indexed, with cultural, science, and history references. Paperback, 48 pages. Learn More

Unfurling this strip is quite a dramatic statement—it’s just under 3 inches wide and almost 100 feet long! The Long Black Strip represents time from the beginning of the formation of Earth to the first human life on Earth. Learn More

This package provides beautifully made materials children will use to explore and research the history of life on Earth. A red strip at the end of the control shows how long humans have been here. Learn More

This beautiful, hand-colored Time Line shows the story of the human journey from the end of the Pliocene (the advent of our hominid ancestors) to the beginning of the Holocene, ending at the Bronze Age. Learn More

An appealing look at which common devices and tools people use to measure which kinds of things. Sure to inspire all sorts of spontaneous measuring activities — just add a measuring tape! Paperback, 16 pages. Learn More

This set of analog stamps gives you numerous possibilities for helping children learn to tell time. One stamp shows five-minute divisions (no numerals); the second shows one-minute divisions (no numerals); and the third shows five-minute divisions with hour numerals. Learn More

“A clock can measure time. But once there were no clocks! Long long ago, people measured time with the sun.” From pre-agricultural solar calendars through the atomic clock, this absorbing book captures the history of time and time measurement. Learn More

Time literally passes before the child’s eyes as white sand funnels down through the hourglass. There are many possible uses for the three plastic timers that comprise this set. These inexpensive timers are approximately one, two, and three minutes. Learn More

The most popular classroom clock ever to help children learn to tell time. The Judy Clock has movable hands and large, clear hour numbers on the face. Grasp the knob on the minute hand to turn it and watch the visible, working gears simultaneously move the hour hand. Children clearly see that turning the minute hand one complete revolution causes the hour hand to move forward one hour. Learn More

Award-winning author/illustrator Steve Jenkins impresses us with this unique presentation of time and history that can serve as a springboard for a child’s own exploration (perhaps with a stopwatch) of how much time different activities take. Hardcover, 34 pages. Learn More

This well-made, flexible coated fiberglass tape has heat-sealed markings: inches on one side and centimeters on the other. Just pull on the tape to extend it, then wind it back up. Plastic casing, metal crank. 33 ft. Learn More

Learn to tell time on the hour, half hour, or quarter hour, and in five-minute increments. The front of each card shows an analog clock, the back shows digital time and the time in words. 4 activity and 52 flash cards. Learn More